Class CEZGZipToFile

class CEZGZipToFile : public CBase;

Description

A CEZGZipToFile object allows de-compression of a compressed file. The name of the compressed file is passed into the constructor along with a target file to contain the uncompressed data. The file is uncompressed by calling the CEZGZipToFile::InflateL() function.

Derivation

• CBase - Base class for all classes to be instantiated on the heap.

• CEZGZipToFile - A CEZGZipToFile object allows de-compression of a compressed file. The name of t...

Members

Defined in CEZGZipToFile:

• InflateL()De-compresses the current zip file in stages. The function needs to called again...
• NewL(RFs &,const TDesC &,RFile &,TInt)Creates a new CEZGZipToFile object
• NewLC(RFs &,const TDesC &,RFile &,TInt)Creates a new CEZGZipToFile object and leaves it on the CleanupStack
• ResetL(RFs &,const TDesC &,RFile &,TInt)Quits the current de-compression operation and restarts with the specified argum...

Inherited from CBase:

• Delete(CBase *)Deletes the specified object.
• Extension_(TUint,TAny *&,TAny *)Extension function
• operator new(TUint)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TAny *)Initialises the object to binary zeroes.
• operator new(TUint,TLeave)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TLeave,TUint)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TUint)Allocates the object from the heap and then initialises its contents to binary z...

Related Topics

 » Symbian OS v9.4 » Examples » System Library example code » EzlibExample: Using EZLIB API to compress and decompress files

• EzlibExample: Using EZLIB API to compress and decompress files » Class summary

IMPORT_C static CEZGZipToFile* NewLC(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize=0x8000);

Description

Creates a new CEZGZipToFile object and leaves it on the CleanupStack

Parameters

RFs &aRfs open file server session const TDesC16 &aGzFileName name of the file to be de-compressed RFile &aOutput the target file to hold the un-compressed data TInt aBufferSize required size of buffers

Return value

CEZGZipToFile * a pointer to the new CEZGZipToFile object, left on the CleanupStack

IMPORT_C static CEZGZipToFile* NewL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize=0x8000);

Description

Creates a new CEZGZipToFile object

Parameters

RFs &aRfs open file server session const TDesC16 &aGzFileName name of the file to be de-compressed RFile &aOutput the target file to hold the un-compressed data TInt aBufferSize required size of buffers

Return value

CEZGZipToFile * a pointer to the new CEZGZipToFile object

IMPORT_C void ResetL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize=0x8000);

Description

Quits the current de-compression operation and restarts with the specified arguments

Parameters

RFs &aRfs open file server session const TDesC16 &aGzFileName name of the file to be de-compressed RFile &aOutput the target file to hold the un-compressed data TInt aBufferSize required size of buffers

Leave codes

... Any of the system wide error codes

IMPORT_C TBool InflateL();

Description

De-compresses the current zip file in stages. The function needs to called again until the de-compression is finalised, in which case it will return EFalse - for example...

while ( decompressor->InflateL() )
    {
    // No action required
    }

Return value

TBool ETrue if the de-compression is not complete, and function must be called again EFalse if the de-compression is finalised

Leave codes

KEZlibErrBadGZipCrc Invalid CRC check ... Any of the system wide error codes